#663840
Closest named color: Purple Brown (#673A3F). oklch(40% 0.066 9.3), rgb(102, 56, 64).
Aa
White text reads best on this color (9.52:1).
About this color
#663840 is a dark, muted red. In OKLCH its lightness is 40%, its chroma 0.066 and its hue 9°. Its hue sits on the warm side of the wheel. The nearest named color is Purple Brown (#673A3F), ΔE 0.007 away. White text reads best on it, at 9.52:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | muted (0.066) |
| Temperature | warm |
| Nearest name | Purple Brown (#673A3F) |
| Black text | 2.20:1 |
| White text | 9.52:1 |
Values
| HEX | #663840 |
| RGB | rgb(102, 56, 64) |
| HSL | hsl(350, 29%, 31%) |
| OKLCH | oklch(40% 0.066 9.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #663840 | 9.52:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #663840 | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #663840 text on white | 9.52:1 | AAA | Lc 91.8 | Preferred for body text |
| #663840 text on black | 2.20:1 | Fails | Lc -10.6 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#FAF4F4
oklch(97.2% 0.006 17.3)
-
Step 100
100
#F3E6E8
oklch(93.6% 0.014 6.7)
-
Step 200
200
#EAD2D5
oklch(88.4% 0.027 9.1)
-
Step 300
300
#DEB4BA
oklch(80.9% 0.049 8.6)
-
Step 400
400
#CC8C96
oklch(70.6% 0.079 9)
-
Step 500
500
#BE6F7C
oklch(63.2% 0.101 9.8)
-
Step 600
600
#A95665
oklch(55.7% 0.109 9.8)
-
Step 700
700
#914554
oklch(49.1% 0.103 9.2)
-
Step 800
800
#753945
oklch(42.6% 0.085 8.7)
-
Step 900
900 (this color)
#663840
oklch(40% 0.066 9.3)
-
Step 950
950
#381D22
oklch(26.9% 0.043 8.4)
#663840 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #404040 | 0.072 |
| Deuteranopia (no green cones) | #4B493F | 0.068 |
| Tritanopia (no blue cones) | #6E343B | 0.018 |
| Achromatopsia (no color) | #454545 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663840
#663840
oklch(40% 0.066 9.3)
- #0A534F
#0A534F
oklch(40% 0.066 189)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #663840, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Purple Brown #673A3F ΔE 0.007
- Brownish Purple #76424E ΔE 0.046
- Chestnut #742802 ΔE 0.071
- Charcoal Grey #3C4142 ΔE 0.078
- Mud Brown #60460F ΔE 0.085
- Red Brown #8B2E16 ΔE 0.086
- Wine Red #7B0323 ΔE 0.086
- Bordeaux #7B002C ΔE 0.088
Use #663840 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.